| ecobabble | (noun) using the technical language of ecology to make the user seem ecologically aware | - |
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| ecologist | (noun) a biologist who studies the relation between organisms and their environment | - |
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| ecology | (noun) the branch of biology concerned with the relations between organisms and their environment | Synonyms: bionomics, environmental science |
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| (noun) the environment as it relates to living organisms | - |
| econometrician | (noun) an economist who uses statistical and mathematical methods | Synonyms: econometrist |
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| econometrics | (noun) the application of mathematics and statistics to the study of economic and financial data | - |
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| econometrist | (noun) an economist who uses statistical and mathematical methods | Synonyms: econometrician |
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| economics | (noun) the branch of social science that deals with the production and distribution and consumption of goods and services and their management | Synonyms: economic science, political economy |
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| economiser | (noun) a frugal person who limits spending and avoids waste | Synonyms: economizer |
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| economist | (noun) an expert in the science of economics | Synonyms: economic expert |
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| economizer | (noun) a frugal person who limits spending and avoids waste | Synonyms: economiser |
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| economy | (noun) an act of economizing; reduction in cost | Synonyms: saving |
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| (noun) frugality in the expenditure of money or resources | Synonyms: thriftiness |
| (noun) the efficient use of resources | - |
| (noun) the system of production and distribution and consumption | Synonyms: economic system |
| ecosystem | (noun) a system formed by the interaction of a community of organisms with their physical environment | - |
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| ecoterrorism | (noun) violence carried out to further the political or social objectives of the environmentalists | Synonyms: eco-warfare, ecological terrorism, ecological warfare |
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| ecotourism | (noun) tourism to exotic or threatened ecosystems to observe wildlife or to help preserve nature | - |
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